Figure 1: (Top) When dark particles are placed on the back of a violin vibrating on resonance, the particles move to the vibrational nodes. The resulting patterns, known as Chladni figures, depend on the vibrational frequency and provide a visual manifestation of each resonance. (Bottom) Poulain and colleagues [1] observed Chladni patterns when they placed microparticles within a liquid above a thin oscillating plate in a microfluidics device. Because of the fluid dynamics in their device, the particles were, unlike the particles on the violins, transported away from the nodes (dashed white lines) and towards the vibrational antinodes.
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